1. To subject a person or something, to a special treatment in preparation for a subsequent experience, process, test, etc.: "Henry had to precondition the surface of the table before starting the final painting."
2. Etymology: apparently from Latin precondicere, "to talk over together before, to agree with in advance"; from pre-, "before" + con-, "with, together" + dicere, "to say".

Relating to having something in a desired state for a special use: "Drew wanted to buy some preconditioned printing paper for the special project he was working on."